基于Yang-Mills和viscous fluid组合动力学的重离子碰撞中的逐事件各向异性流
Event-by-event anisotropic flow in heavy-ion collisions from combined Yang-Mills and viscous fluid dynamics
摘要：
结合早期玻璃流的经典Yang-Mills描述和随后物质通过夸克-胶子等离子体和强子气相的相对论粘性流体动力学演化，计算了重离子碰撞中各向异性流系数v_1-v_5.在IP-GARMA模型中实现的Glasma动力学考虑了核子位置的逐事件几何波动和固有的亚核子尺度色荷波动;然后将物质的预平衡流与描述粘性流体动力学流和冻结时粒子产生的MUSIC算法相匹配。IP-MUSIma +MUSIC模型较好地描述了在大型强子对撞机（LHC）和相对论重离子对撞机（RHIC）上测量的与横动量相关的和积分的v_n数据。该模型还再现了ATLAS合作测量的v_2、v_3和v_4的逐事件分布。我们的结果的影响，更好地理解的动力学的玻璃以及提取的夸克-胶子等离子体的输运性质的概述。
英文摘要：
Anisotropic flow coefficients v_1-v_5 in heavy ion collisions are computed by combining a classical Yang-Mills description of the early time glasma flow with the subsequent relativistic viscous hydrodynamic evolution of matter through the quark-gluon plasma and hadron gas phases. The glasma dynamics, as realized in the IP-Glasma model, takes into account event-by-event geometric fluctuations in nucleon positions and intrinsic sub-nucleon scale color charge fluctuations; the pre-equilibrium flow of matter is then matched to the MUSIC algorithm describing viscous hydrodynamic flow and particle production at freeze-out. The IP-Glasma+MUSIC model describes well both transverse momentum dependent and integrated v_n data measured at the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC). The model also reproduces the event-by-event distributions of v_2, v_3 and v_4 measured by the ATLAS collaboration. The implications of our results for better understanding of the dynamics of the glasma as well as for the extraction of transport properties of the quark-gluon plasma are outlined.
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